Biotin

Biotin is a water-soluble B vitamin (B7) essential for healthy hair, skin, and nails. In hair care, it is used both as a topical ingredient and a dietary supplement. Biotin plays a crucial role in the production of keratin, the protein that makes up hair structure. While oral biotin supplementation is heavily marketed, topical application in hair products has more limited evidence.

Source: Synthesized or derived from bacterial fermentation; found naturally in eggs, nuts, and whole grains

Origin: Synthetic

Also known as: Vitamin B7, Vitamin H, D-Biotin, Coenzyme R

Topical Biotin is believed to improve hair strand thickness and strengthen the hair shaft by supporting keratin infrastructure. It coats the hair to add volume and the appearance of fullness. In shampoos and conditioners, it functions primarily as a volumizing and strengthening agent, though its ability to penetrate the scalp topically is debated.

Best For

Thinning hair, fine hair, limp hair wanting volume

Not Recommended For

Not known to be problematic for any hair type

Concentration Matters

0.01-1%

Very safe topically. Oral biotin supplements can interfere with certain lab tests (thyroid panels, cardiac troponin). Topical use has no known adverse effects. Deficiency is rare in people with normal diets.

FDA Status: Generally Recognized As Safe

FDA recognizes biotin as an essential nutrient. Supplements are regulated as dietary supplements. No restrictions on topical cosmetic use.

EWG Score: 1/10

Volumizing shampoos, hair growth serums, scalp treatments, supplements

If you want to avoid Biotin, look for products with these ingredients instead:

Panthenol, Niacinamide, Caffeine, Saw Palmetto Extract